From klee@purdue.edu Sat Jan 07 16:18:42 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!klee From: klee@purdue.edu (Katrin Lee) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jan07.161842.8066@purdue.edu> Date: Sat, 07 Jan 1995 16:18:42 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. Anyone running this on a Quadra 840AV with the 68040? -- Katrin Lee Practical Peripherals 14.4 @ 19,200 bps "Measuring a record you own is listening, not piracy." From hramirez@rwth-aachen.de Mon Jan 09 15:13:42 1995 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!hramirez From: hramirez@rwth-aachen.de (Hugo Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jan09.151342.2122@rwth-aachen.de> Date: Mon, 09 Jan 1995 15:13:42 GMT References: <1995Jan07.161842.8066@purdue.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan07.161842.8066@purdue.edu>, klee@purdue.edu (Katrin Lee) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Hugo Ramírez *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From cmacdonald@mit.edu Wed Jan 11 15:35:42 1995 Path: ashpoly!cascade!mxgate!coyoacan!mit!cmacdonald From: cmacdonald@mit.edu (Camila MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jan11.153542.7414@mit.edu> Date: Wed, 11 Jan 1995 15:35:42 GMT References: <1995Jan07.161842.8066@purdue.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan07.161842.8066@purdue.edu>, klee@purdue.edu (Katrin Lee) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. > A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Camila MacDonald | cmacdonald@mit.edu PGP Key fingerprint: 27D8 DE82 3681 FF51 "Keep the channels open."